fn

import { fn } from "jsr:@ende/expect";

function

function fn(...stubs: Function[]): Function

Creates a mock function that can be used for testing and assertions.

...stubs: Function[]: Functions to be used as stubs for different calls.

Returns

A mock function that keeps track of calls and returns values based on the provided stubs.

Example: Usage

import { fn, expect } from "@ende/expect";

Ende.test("example", () => {
  const mockFn = fn(
    (a: number, b: number) => a + b,
    (a: number, b: number) => a - b
  );
  const result = mockFn(1, 2);
  expect(result).toEqual(3);
  expect(mockFn).toHaveBeenCalledWith(1, 2);
  expect(mockFn).toHaveBeenCalledTimes(1);

  const result2 = mockFn(3, 2);
  expect(result2).toEqual(1);
  expect(mockFn).toHaveBeenCalledWith(3, 2);
  expect(mockFn).toHaveBeenCalledTimes(2);
});

Source